sunxi: add board documentation
Add some long overdue instructions for building and installing U-Boot on
Allwinner SoC based boards.
This describes the building process, including TF-A and crust, plus
installation to SD card, eMMC and SPI flash, both from Linux and U-Boot
itself. Also describe FEL booting.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/doc/board/allwinner/index.rst b/doc/board/allwinner/index.rst
new file mode 100644
index 0000000..7352ccd
--- /dev/null
+++ b/doc/board/allwinner/index.rst
@@ -0,0 +1,9 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+Allwinner (sunxi) boards
+========================
+
+.. toctree::
+ :maxdepth: 2
+
+ sunxi